In a circuit a cell with internal resistance \( r \) is connected t...

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In a circuit a cell with internal resistance \( r \) is connected to an external resistance \( R \). The condition
\( \mathrm{P} \) for the maximum current that drawn from the cell

W is
(a) \( R=r \)
(b) \( Rr \)
(c) \( Rr \)
(d) \( R=0 \)
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